rodrigst, thanks for asking. I've been wondering too.
My guess is that Marriott is waiting for end-of-year stays to be credited to MR accounts. I'll probably keep checking every day until I see the 2014 totals show up.
If my memory serves me correctly (there a guess) I believe the clock on your account will reset on 1/15/14, and then on 1/31/14, your elite status earned from calendar year 2013 will be reflected and be at that until 1/31/15 or longer if you obtain a higher level. Then that higher level is good through the calender year you earned it and all of the following year.
Gosh I hope that is correct.